The immune system can be defined as the organs and body processes that resist the infection and toxins. A virus can be defined as a biological agent which reproduces inside the living cells of the hosts. When there is an infection by a virus, the host cell produces thousands of similar copies of the original virus at an unexpected rate.

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Chapter 21, Problem 9LTB

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The immune system can be defined as the organs and body processes that resist the infection and toxins. A virus can be defined as a biological agent which reproduces inside the living cells of the hosts. When there is an infection by a virus, the host cell produces thousands of similar copies of the original virus at an unexpected rate.

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